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Visual suppression in intermittent exotropia during binocular alignment.

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Serrano Pedraza, Ignacio and Manjunath, Vina and Osunkunle, Olaoluwakitan and Clarke, Michael P and Read, Jenny C A (2011) Visual suppression in intermittent exotropia during binocular alignment. Investigative ophthalmology & visual science, 52 (5). pp. 2352-64. ISSN 1552-5783

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Official URL: http://dx.doi.org/10.1167/iovs.10-6144




Abstract

PURPOSE

To investigate the cortical mechanisms that prevent diplopia in intermittent exotropia (X(T)) during binocular alignment (orthotropia).

METHODS

The authors studied 12 X(T) patients aged 5 to 22 years. Seventy-five percent had functional stereo vision with stereoacuity similar to that of 12 age-matched controls (0.2-3.7 min arc). Identical face images were presented to the two eyes for 400 ms. In one eye, the face was presented at the fovea; in the other, offset along the horizontal axis with up to 12° eccentricity. The task was to indicate whether one or two faces were perceived.

RESULTS

All X(T) patients showed normal diplopia when the nonfoveal face was presented to nasal hemiretina, though with a slightly larger fusional range than age-matched controls. However, 10 of 12 patients never experienced diplopia when the nonfoveal face was presented to temporal hemiretina (i.e., when the stimulus simulated exodeviation). Patients showed considerable variability when the single image was perceived. Some patients suppressed the temporal stimulus regardless of which eye viewed it, whereas others suppressed a particular eye even when it viewed the foveal stimulus. In two patients, the simulated exodeviation might have triggered a shift from normal to anomalous retinal correspondence.

CONCLUSIONS

Antidiplopic mechanisms in X(T) can be reliably triggered by purely retinal information during orthotropia, but the nature of these mechanisms varies between patients.


Item Type:Article
Uncontrolled Keywords:Child, diplopia, Face, Perception, Eye, Nose
Palabras clave (otros idiomas):Niño, Miopía, Cara, Percepción visual, Cara, Ojo, Nariz
Subjects:Medical sciences > Psychology > Experimental psychology
Medical sciences > Psychology > Perception
Medical sciences > Optics > Visual perception
ID Code:36287
Deposited On:11 Nov 2016 14:38
Last Modified:11 Nov 2016 14:38

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